Mitigating connection identifier collisions in a communication network

• US 8,706,889 B2
• Filed: 09/10/2010
• Issued: 04/22/2014
• Est. Priority Date: 09/10/2010
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Marquardt, David R., Paranjape, Prashant A.
• Primary Examiner(s): Mejia, Anthony
• Application Number:
  US12/879,786
• Publication Number:
  US 20120066399A1
• Time in Patent Office: 1,320 Days
• Field of Search: 709/203, 709227-228
• US Class Current: 709/228
• CPC Class Codes: H04L 67/142 Managing session states for stateless protocols; Signalling session states; State transitions; Keeping-state mechanisms
• CPC Class Codes: H04L 69/162 involving adaptations of sockets based mechanisms secure socket layer H04L63/168

Abstract

A new instance of a connection that is in the wait state can be established while mitigating connection identifier collisions. Based on a connection identifier in a connection request received at a server from a client, it is determined that a previous instance of a connection represented by the connection identifier is in a wait state. An acknowledgement message comprising wait state parameters associated with the connection identifier and original connection parameters associated with the previous instance of the connection in the wait state is provided from the server to the client. In response, the server receives a compliance message comprising updated wait state parameters and updated connection parameters from the client. The new instance of the connection represented by the connection identifier that previously represented the previous instance of the connection is established based, at least in part, on the updated wait state parameters and the updated connection parameters.

Claims

1. A method comprising:

after determining that a connection will be or has been set to a wait state, generating a value and associating the value with a connection identifier that identifies the connection;

associating a last timestamp and a last sequence number of the connection with the association of the generated value and the connection identifier;

after generating the value and associating the value with the connection identifier, determining, based on the connection identifier in a connection request received at a server from a client after the connection was set to the wait state, that a previous instance of the connection identified by the connection identifier is in the wait state, wherein the association of the value and the connection identifier identifies the previous instance of the connection;

determining wait state parameters associated with the connection identifier and original connection parameters associated with the previous instance of the connection in the wait state, wherein the original connection parameters include the last sequence number and the last timestamp and the wait state parameters include the association of the value and the connection identifier;

providing an acknowledgement message from the server to the client that comprises the wait state parameters and the original connection parameters;

receiving, in response to the acknowledgement message, a compliance message at the server from the client that comprises updated wait state parameters and updated connection parameters; and

establishing, with the client, a new instance of the connection identified by the connection identifier, wherein the new instance of the connection is established based, at least in part, on the updated wait state parameters and the updated connection parameters.

2. The method of claim 1, wherein the connection identifier identifies a port of the client that represents a first end point of the connection that is represented by the connection identifier, a port of the server that represents a second end point of the connection that is represented by the connection identifier, an address of the client, an address of the server, and a connection protocol.

3. The method of claim 1, wherein the wait state parameters further comprise a flag that indicates that the previous instance of the connection identified by the association of the value and the connection identifier is in the wait state.

4. The method of claim 1, wherein the updated wait state parameters comprise a flag that indicates acknowledgement that the previous instance of the connection identified by the association of the value and the connection identifier is in the wait state.

5. The method of claim 1, further comprising:

determining whether the updated connection parameters are greater than the original connection parameters;

accepting the updated connection parameters for said establishing the new instance of the connection represented by the connection identifier if the updated connection parameters are greater than the original connection parameters; and

rejecting the new instance of the connection represented by the connection identifier if the updated connection parameters are not greater than the original connection parameters.

6. The method of claim 1, further comprising:

determining, at the server, whether the updated wait state parameters comprise a flag that indicates acknowledgement that the previous instance of the connection identified by the association of the value and the connection identifier is in the wait state;

accepting the updated connection parameters for said establishing the new instance of the connection represented by the connection identifier if the updated wait state parameters comprise the flag that indicates acknowledgement that the previous instance of the connection is in the wait state; and

rejecting the new instance of the connection represented by the connection identifier if the updated wait state parameters do not comprise the flag that indicates acknowledgement that the previous instance of the connection is in the wait state.

7. The method of claim 1, wherein the updated wait state parameters indicate whether the client acknowledged that the previous instance of the connection identified by the association of the value and the connection identifier is in the wait state.

8. A computer program product for mitigating connection identifier collisions, the computer program product comprising:

a non-transitory computer readable storage medium having computer usable program code embodied therewith, the computer readable program code comprising computer readable program code to,

after a determination that a connection will be or has been set to a wait state, generate a value and associate the value with a connection identifier that identifies the connection;

associate a last timestamp and a last sequence number of the connection with the association of the generated value and the connection identifier;

after generation of the value and association of the value with the connection identifier, determine, based on the connection identifier in a connection request received from a client after the connection was set to the wait state, that a previous instance of the connection identified by the connection identifier is in the wait state, wherein the association of the value and the connection identifier identifies the previous instance of the connection;

determine wait state parameters associated with the connection identifier and original connection parameters associated with the previous instance of the connection in the wait state, wherein the original connection parameters include the last sequence number and the last timestamp and the wait state parameters include the association of the value and the connection identifier;

provide, to the client, an acknowledgement message that comprises the wait state parameters and the original connection parameters;

receive, in response to the acknowledgement message, a compliance message from the client that comprises updated wait state parameters and updated connection parameters; and

establish, with the client, a new instance of the connection identified by the connection identifier, wherein the new instance of the connection is established based, at least in part, on the updated wait state parameters and the updated connection parameters.

9. The computer program product of claim 8, wherein the connection identifier identifies a port of the client that represents a first end point of the connection that is represented by the connection identifier, a port of a server that represents a second end point of the connection that is represented by the connection identifier, an address of the client, an address of the server, and a connection protocol.

10. The computer program product of claim 8, wherein the computer readable program code is further configured to:

determine whether the updated connection parameters are greater than the original connection parameters;

accept the updated connection parameters for establishing the new instance of the connection represented by the connection identifier if the updated connection parameters are greater than the original connection parameters; and

reject the new instance of the connection represented by the connection identifier if the updated connection parameters are not greater than the original connection parameters.

11. The computer program product of claim 8, wherein the computer readable program code is further configured to:

determine whether the updated wait state parameters comprise a flag that indicates acknowledgement that the previous instance of the connection identified by the association of the value and the connection identifier is in the wait state;

accept the updated connection parameters for establishing the new instance of the connection represented by the connection identifier if the updated wait state parameters comprise the flag that indicates acknowledgement that the previous instance of the connection identified by the association of the value and the connection identifier is in the wait state; and

reject the new instance of the connection represented by the connection identifier if the updated wait state parameters do not comprise the flag that indicates acknowledgement that the previous instance of the connection identified by the association of the value and the connection identifier is in the wait state.

12. A communication network device comprising:

a processor;

a network interface coupled with the processor; and

a connection unit coupled with the processor and with the network interface, the connection unit operable to,

after a determination that a connection will be or has been set to a wait state, generate a value and associate the value with a connection identifier that identifies the connection;

associate a last timestamp and a last sequence number of the connection with the association of the generated value and the connection identifier;

after generation of the value and association of the value with the connection identifier, determine, based on the connection identifier in a connection request received at the communication network device from a second communication network device after the connection was set to the wait state, that a previous instance of the connection represented by the connection identifier is in the wait state, wherein the association of the value and the connection identifier identifies the previous instance of the connection;

determine wait state parameters associated with the connection identifier and original connection parameters associated with the previous instance of the connection in the wait state, wherein the original connection parameters include the last sequence number and the last timestamp and the wait state parameters include the association of the value and the connection identifier;

provide an acknowledgement message that comprises the wait state parameters and the original connection parameters from the communication network device to the second communication network device;

receive, in response to the acknowledgement message, a compliance message at the communication network device from the second communication network device that comprises updated wait state parameters and updated connection parameters; and

establishing, with the second communication network device, a new instance of the connection identified by the connection identifier, wherein the new instance of the connection is established based, at least in part, on the updated wait state parameters and the updated connection parameters.

13. The communication network device of claim 12, wherein the connection unit is further operable to:

determine whether the updated connection parameters are greater than the original connection parameters;

accept the updated connection parameters for establishing the new instance of the connection represented by the connection identifier if the updated connection parameters are greater than the original connection parameters; and

reject the new instance of the connection represented by the connection identifier if the updated connection parameters are not greater than the original connection parameters.

14. The communication network device of claim 12, wherein the connection unit is further operable to:

determine whether the updated wait state parameters comprise a flag that indicates acknowledgement that the previous instance of the connection identified by the association of the value and the connection identifier is in the wait state;

accept the updated connection parameters for establishing the new instance of the connection represented by the connection identifier if the updated wait state parameters comprise the flag that indicates acknowledgement that the previous instance of the connection identified by the association of the value and the connection identifier is in the wait state; and

reject the new instance of the connection represented by the connection identifier if the updated wait state parameters do not comprise the flag that indicates acknowledgement that the previous instance of the connection identified by the association of the value and the connection identifier is in the wait state.